Circulatory system/blood

• Red Blood Cells Carry Oxygen
• The circulatory system transports blood around the body
• Blood contains red blood cells, white blood cells, and platelets
• Red Blood Cells


  • They contain a red pigment called haemoglobin
  • In the lungs, the haemoglobin binds to oxygen
  • This oxygen is then transported around the body
• White Blood Cells Defend Against Infection
• Platelets


  • They are small fragments of cells
  • They help the blood to clot at wounds to stop bleeding
  • Lack of platelets can cause excessive bleeding and bruising
• Plasma


  The liquid that carries everything in blood
• What plasma carries


  • Red and white blood cells
  • Platelets
  • Nutrients
  • Carbon dioxide
  • Hormones
  • Antibodies
• Blood tests can be used to diagnose many things, not just disorders of the blood
• The blood transports chemicals produced by many organs, and it's easier to take blood than a piece of muscle